Mini hydrolic power generator project??

[Laniakea]

Heyo guys! I want to ask your opinion about a possible project which I and anyone else could make for their science/physics project. Last time in that forum I asked how could I make schlieren imaging but I failed to deliver that project because it was so hard to achieve. I think this one is so much more easier so anyone can reproduce on their own. I'm thinking if I can take two decent sized pet water bottles and put them in a position where one is turned 180 degrees and above the other one (kind of like a hourglass) and there's a dc or some kind of motor between them in some enclosure. There's only one bottle worth of water at a time in the system so at the starting position water will fall from the top bottle to the other bottle thus turning the turbine. The neck of the bottle, amount of water flowing in one second, the velocity of water falling down, the amount of anything, you name it, can be changed of course. The output can be anything from here, another fan, an LED, a battery. Just giving the concept idea here, do you see any flaws within the concept which will prevent it from working? Thanks for reading and hopefully replying

 

Oh and here is a so simple drawing of the concept:

(what a childish drawing you say huh!  I can hear it, I don't have that much skill in paint sorry!)

[Laniakea]

4 hours ago, James Evens said:

Do the calculation how much energy there is. I think 50% system efficiency should be good enough for a approximation.

After your turbine you need a full bridge rectifier and caps/voltage regulator.

I was thinking I would just put together a dc motor and an LED and maybe some capacitors resistors  I have bearly any knowledge of electric circuits. So wouldn't it work? Doesn't dc motors create and input dc power? Why would I need to use a full brige rectifier so called thing to convert one to the other? Probably you said that for charging a battery so I won't continue from here  And how could I make it so it is really like an hourglass? I can rotate it and it will work the same way doesn't matter the orientation, I know the turbine will turn the other way so I don't know how we'll sort that out. It's no problem for running an LED but just a side quest  

[Laniakea]

4 minutes ago, James Evens said:

Your generator is AC. If you would connect the diode (LED) directly to it it would flicker with the frequency from the generator. Also you would just use one half of the sine wave if you don't convert it to DC. Depending on the type of motor you use the circuit will vary. The cap/voltage regulator are further needed to give it a steady brightness.

Wow just amazing description, thanks for brightening! Any ideas on how we could make it work both ways and keep the positive/negative at the same side? Like if we turn the bottles water will flow the other way and the negative and positive will reverse. If you have an awnser to that too man you're really gonna take all the credit of my school project